Physical Sciences and Mathematics Commons^™

Selenium In Nebraska's Groundwater And Streams, R.A. Engberg

Conservation and Survey Division

No abstract provided.

Evolution Verticale De La Serie Sedimentaire Et Repartition Laterale Des Facies De La Region De Haymana, Salih Yüksel

Bulletin of the Mineral Research and Exploration

No abstract provided.

Development Of The Turbidity Maximum In A Coastal Plain Estuary : Final Report, Maynard M. Nichols, Galen Thompson

Reports

A study of the turbidity maximum in the Rappahannock Estuary; Virginia was conducted to determine how high concentrations of suspended sediment accumulate to form a maximum.

Time-series observations of current velocity, salinity and suspended sediment over 8 to 18 tidal cycles reveal that the maximum forms in a convergence of bottom residual currents near the transition between fresh and salty water. Sediment supplied mainly by the river is transported into the convergence by density currents and accumulates since velocity is nearly zero and settling exceeds upward mixing.

The maximum forms in the middle estuary after freshet or flooding and shifts …

Groundwater Levels In Nebraska, 1972, M.J. Ellis

Conservation and Survey Division

No abstract provided.

Soil Structure Changes Under Wheatbelt Farming Systems, T C. Stoneman

Journal of the Department of Agriculture, Western Australia, Series 4

A review of 14 years of Department of Agriculture research into the effects of wheatbelt fanning practices on soil structure reaches the general conclusion that cultivation and grazing practices influence soil structure, and that structure can be improved by soil amendments and pasture growth.

Little data has been obtained to relate plant growth to improved soil structure, as measured.

Topographic Regions Map

Conservation and Survey Division

No abstract provided.

Water Resources Data For Nebraska Part 2-Water Quality Records

Conservation and Survey Division

No abstract provided.

Evaluation Of Nitrate Content Of Ground Water In Hall County, Nebraska, Rauf Piskin

Conservation and Survey Division

No abstract provided.

The Pierre-Niobrara Unconformity In Western Nebraska, Harold M. Degraw

Conservation and Survey Division

The Pierre-Niobrara unconformity, one of several significant unconformities in the Cretaceous System of the Western Interior region, has not generally been recognized. Detailed correlation of electric logs of a large number of wells in western Nebraska provides evidence of its existence. Isopach maps of the beds occupying three identifiable stratigraphic intervals - a redefined Niobrara Formation, an unnamed uppermost Niobrara unit, and an unnamed basal Pierre unit, which includes the Ardmore Bentonite - provide recognizable geologic patterns that permit reconstruction of the stages of development of the unconformity. The upper part of the Niobrara Formation has been truncated in several …

Nebraska Groundwater Level (Decline & Rise), 1973

Conservation and Survey Division

No abstract provided.

Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1973

Conservation and Survey Division

No abstract provided.

Inner Shelf Sediments Off Chesapeake Bay. Iii, Heavy Minerals, Bruce K. Goodwin, John B. Thomas

Reports

The heavy minerals in the sand sized fraction of 112 grab samples collected off the Virginia coast were analyzed for their variations in mineralogy. The main purpose was to characterize the heavy mineral suite and to delineate potentially important economic areas.

Stratigraphic Comparison Of The Precambrian Wyman And Johnnie Formations In The Western Great Basin, California, Johnnie Nathan Moore

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Precambrian Johnnie Formation in the Death Valley area and to the south is separable into two facies. The southern facies contains six distinct members: the transitional, quartzite, lower carbonate-bearing, siltstone, upper carbonate-bearing, and Rainstorm members. Dolomite, quartzite, and mudstone characterize the southern facies, as does the presence of the Johnnie oolite. To the north the Johnnie oolite pinches out and the amount of mudstone in the formation increases. The dominantly mudstone northern facies contains local gray limestone lenses closely similar to limestone in the Wyman Formation in the White-Inyo Mountains. Generally outcrops of the northern facies of the Johnnie …